<script>
    class JS {
        Array() {
            return {
                push: function () {

                },
                pop: function () {

                }
            }
        }


        Math() {
            return {
                ceil: function () {

                },
                floor: function () {

                }
            }
        }

        String() {
            return {
                toString: function () {

                }
            }
        }

    }


    let js = new JS;
    console.log(js);


    let arr = js.Array();
    console.log(arr);
</script>